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  "submitter": "David Renshaw",
  "created_at": "2026-08-20 00:25:25",
  "comments": [
    {
      "author": "David Renshaw",
      "created_at": "2026-08-20 00:25:25",
      "content": "Extended the previous length-896 record using randomized mobility-ordered depth-first search from late prefixes; independently verified with a quadratic prefix-sum checker."
    }
  ]
}